Customized Mugs, CuppaJo Diner Mug - 12 oz - Stoneware, The classic design of the CuppaJo Diner Mug has been used for years in diners and coffee shops. Thick stoneware walls keeps coffee hot. A true classic design Thick stoneware walls keep coffee hot Glossy exterior interior 12 oz capacity when filled to the rim Ceramic mugs are dishwasher safe (note: we recommend hand washing to ensure the life of the imprint) ... #45314 $10.39/each.